Crosslinking of branched PIM-1 and PIM-Py membranes for recovery of toluene from dimethyl sulfoxide by pervaporation

Sulaiman Aloraini, Michael Mathias, Jessica Crone, Kurtis Bryce, Ming Yu, Richard A. Kirk, Mohd Zamidi Ahmad, Edidiong Asuquo, Sandra Rico-Martínez, Alexey V. Volkov, Andrew Foster, Peter Budd

Research output: Contribution to journalArticlepeer-review


Branched forms of the archetypal polymer of intrinsic microporosity PIM-1 and the pyridinecarbonitrile-containing PIM-Py may be crosslinked under ambient conditions by palladium (II) acetate. Branched PIM-1 can arise in polymerizations of 5,5',6,6'-tetrahydroxy-3,3,3',3'-tetramethyl-1,1'-spirobisindane with tetrafluoroterephthalonitrile conducted at high set temperature (160 ºC) under conditions, such as high dilution, that lead to a lower temperature profile over the course of the reaction. Membranes of PIM-1 and PIM-Py crosslinked with palladium acetate are sufficiently stable in organic solvents for use in the recovery of toluene from its mixture with dimethyl sulfoxide by pervaporation at 65ºC. With both PIM-1 and PIM-Py membranes, pervaporation gives high toluene/DMSO separation factors (around 10 with a 77 vol% toluene feed). Detailed analysis shows that the membranes themselves are slightly selective for DMSO and it is the high driving force for toluene evaporation that drives the separation.
Original languageEnglish
Article number
Pages (from-to)1145-1158
JournalACS Applied Polymer Materials
Issue number2
Publication statusPublished - 17 Jan 2023


  • Polymer of intrinsic microporosity
  • crosslinking
  • pervaporation
  • organic-organic separation
  • branched PIMs


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